The uvula is located in the middle of the posterior border of the soft palate in the oral cavity and refers to the downward protruding part of the free edge of the soft palate in the oral cavity. The surface is covered with mucous membrane, and its role includes preventing choking, assisting pronunciation, humidifying air, etc. 1. Anti-choking during eating: During the process of eating, the uvula moves upward, which can block the back of the nose, avoiding the food from entering too quickly into the back of the nostrils, resulting in stimulation of the respiratory tract, choking, blockage and other manifestations. 2. Auxiliary pronunciation: the movement of the uvula can effectively assist pronunciation, through the movement of the uvula, change the direction of airflow, so that pronunciation is more clear. 3. Humidifying air: the glands in the uvula and the mucous membrane of the soft palate have a certain effect of humidifying air in the oral cavity.